drivers/acpi/bus.c

   1 /*
   2  *  acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   5  *
   6  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or (at
  11  *  your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful, but
  14  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  *  General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License along
  19  *  with this program; if not, write to the Free Software Foundation, Inc.,
  20  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  21  *
  22  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/init.h>
  27 #include <linux/ioport.h>
  28 #include <linux/kernel.h>
  29 #include <linux/list.h>
  30 #include <linux/sched.h>
  31 #include <linux/pm.h>
  32 #include <linux/device.h>
  33 #include <linux/proc_fs.h>
  34 #include <linux/acpi.h>
  35 #include <linux/slab.h>
  36 #ifdef CONFIG_X86
  37 #include <asm/mpspec.h>
  38 #endif
  39 #include <linux/pci.h>
  40 #include <acpi/acpi_bus.h>
  41 #include <acpi/acpi_drivers.h>
  42 #include <acpi/apei.h>
  43 #include <linux/dmi.h>
  44 #include <linux/suspend.h>
  45
  46 #include "internal.h"
  47
  48 #define _COMPONENT              ACPI_BUS_COMPONENT
  49 ACPI_MODULE_NAME("bus");
  50
  51 struct acpi_device *acpi_root;
  52 struct proc_dir_entry *acpi_root_dir;
  53 EXPORT_SYMBOL(acpi_root_dir);
  54
  55 #define STRUCT_TO_INT(s)        (*((int*)&s))
  56
  57
  58 #ifdef CONFIG_X86
  59 static int set_copy_dsdt(const struct dmi_system_id *id)
  60 {
  61         printk(KERN_NOTICE "%s detected - "
  62                 "force copy of DSDT to local memory\n", id->ident);
  63         acpi_gbl_copy_dsdt_locally = 1;
  64         return 0;
  65 }
  66
  67 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
  68         /*
  69          * Invoke DSDT corruption work-around on all Toshiba Satellite.
  70          * https://bugzilla.kernel.org/show_bug.cgi?id=14679
  71          */
  72         {
  73          .callback = set_copy_dsdt,
  74          .ident = "TOSHIBA Satellite",
  75          .matches = {
  76                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  77                 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
  78                 },
  79         },
  80         {}
  81 };
  82 #else
  83 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
  84         {}
  85 };
  86 #endif
  87
  88 /* --------------------------------------------------------------------------
  89                                 Device Management
  90    -------------------------------------------------------------------------- */
  91
  92 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
  93 {
  94         acpi_status status = AE_OK;
  95
  96
  97         if (!device)
  98                 return -EINVAL;
  99
 100         /* TBD: Support fixed-feature devices */
 101
 102         status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
 103         if (ACPI_FAILURE(status) || !*device) {
 104                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 105                                   handle));
 106                 return -ENODEV;
 107         }
 108
 109         return 0;
 110 }
 111
 112 EXPORT_SYMBOL(acpi_bus_get_device);
 113
 114 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
 115                                        unsigned long long *sta)
 116 {
 117         acpi_status status;
 118
 119         status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
 120         if (ACPI_SUCCESS(status))
 121                 return AE_OK;
 122
 123         if (status == AE_NOT_FOUND) {
 124                 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
 125                        ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
 126                 return AE_OK;
 127         }
 128         return status;
 129 }
 130
 131 int acpi_bus_get_status(struct acpi_device *device)
 132 {
 133         acpi_status status;
 134         unsigned long long sta;
 135
 136         status = acpi_bus_get_status_handle(device->handle, &sta);
 137         if (ACPI_FAILURE(status))
 138                 return -ENODEV;
 139
 140         STRUCT_TO_INT(device->status) = (int) sta;
 141
 142         if (device->status.functional && !device->status.present) {
 143                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
 144                        "functional but not present;\n",
 145                         device->pnp.bus_id,
 146                         (u32) STRUCT_TO_INT(device->status)));
 147         }
 148
 149         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
 150                           device->pnp.bus_id,
 151                           (u32) STRUCT_TO_INT(device->status)));
 152         return 0;
 153 }
 154 EXPORT_SYMBOL(acpi_bus_get_status);
 155
 156 void acpi_bus_private_data_handler(acpi_handle handle,
 157                                    void *context)
 158 {
 159         return;
 160 }
 161 EXPORT_SYMBOL(acpi_bus_private_data_handler);
 162
 163 int acpi_bus_get_private_data(acpi_handle handle, void **data)
 164 {
 165         acpi_status status = AE_OK;
 166
 167         if (!*data)
 168                 return -EINVAL;
 169
 170         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
 171         if (ACPI_FAILURE(status) || !*data) {
 172                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 173                                 handle));
 174                 return -ENODEV;
 175         }
 176
 177         return 0;
 178 }
 179 EXPORT_SYMBOL(acpi_bus_get_private_data);
 180
 181 static void acpi_print_osc_error(acpi_handle handle,
 182         struct acpi_osc_context *context, char *error)
 183 {
 184         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
 185         int i;
 186
 187         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
 188                 printk(KERN_DEBUG "%s\n", error);
 189         else {
 190                 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
 191                 kfree(buffer.pointer);
 192         }
 193         printk(KERN_DEBUG"_OSC request data:");
 194         for (i = 0; i < context->cap.length; i += sizeof(u32))
 195                 printk("%x ", *((u32 *)(context->cap.pointer + i)));
 196         printk("\n");
 197 }
 198
 199 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
 200 {
 201         int i;
 202         static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
 203                 24, 26, 28, 30, 32, 34};
 204
 205         if (strlen(str) != 36)
 206                 return AE_BAD_PARAMETER;
 207         for (i = 0; i < 36; i++) {
 208                 if (i == 8 || i == 13 || i == 18 || i == 23) {
 209                         if (str[i] != '-')
 210                                 return AE_BAD_PARAMETER;
 211                 } else if (!isxdigit(str[i]))
 212                         return AE_BAD_PARAMETER;
 213         }
 214         for (i = 0; i < 16; i++) {
 215                 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
 216                 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
 217         }
 218         return AE_OK;
 219 }
 220
 221 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 222 {
 223         acpi_status status;
 224         struct acpi_object_list input;
 225         union acpi_object in_params[4];
 226         union acpi_object *out_obj;
 227         u8 uuid[16];
 228         u32 errors;
 229         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 230
 231         if (!context)
 232                 return AE_ERROR;
 233         if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
 234                 return AE_ERROR;
 235         context->ret.length = ACPI_ALLOCATE_BUFFER;
 236         context->ret.pointer = NULL;
 237
 238         /* Setting up input parameters */
 239         input.count = 4;
 240         input.pointer = in_params;
 241         in_params[0].type               = ACPI_TYPE_BUFFER;
 242         in_params[0].buffer.length      = 16;
 243         in_params[0].buffer.pointer     = uuid;
 244         in_params[1].type               = ACPI_TYPE_INTEGER;
 245         in_params[1].integer.value      = context->rev;
 246         in_params[2].type               = ACPI_TYPE_INTEGER;
 247         in_params[2].integer.value      = context->cap.length/sizeof(u32);
 248         in_params[3].type               = ACPI_TYPE_BUFFER;
 249         in_params[3].buffer.length      = context->cap.length;
 250         in_params[3].buffer.pointer     = context->cap.pointer;
 251
 252         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 253         if (ACPI_FAILURE(status))
 254                 return status;
 255
 256         if (!output.length)
 257                 return AE_NULL_OBJECT;
 258
 259         out_obj = output.pointer;
 260         if (out_obj->type != ACPI_TYPE_BUFFER
 261                 || out_obj->buffer.length != context->cap.length) {
 262                 acpi_print_osc_error(handle, context,
 263                         "_OSC evaluation returned wrong type");
 264                 status = AE_TYPE;
 265                 goto out_kfree;
 266         }
 267         /* Need to ignore the bit0 in result code */
 268         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 269         if (errors) {
 270                 if (errors & OSC_REQUEST_ERROR)
 271                         acpi_print_osc_error(handle, context,
 272                                 "_OSC request failed");
 273                 if (errors & OSC_INVALID_UUID_ERROR)
 274                         acpi_print_osc_error(handle, context,
 275                                 "_OSC invalid UUID");
 276                 if (errors & OSC_INVALID_REVISION_ERROR)
 277                         acpi_print_osc_error(handle, context,
 278                                 "_OSC invalid revision");
 279                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 280                         if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
 281                             & OSC_QUERY_ENABLE)
 282                                 goto out_success;
 283                         status = AE_SUPPORT;
 284                         goto out_kfree;
 285                 }
 286                 status = AE_ERROR;
 287                 goto out_kfree;
 288         }
 289 out_success:
 290         context->ret.length = out_obj->buffer.length;
 291         context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL);
 292         if (!context->ret.pointer) {
 293                 status =  AE_NO_MEMORY;
 294                 goto out_kfree;
 295         }
 296         memcpy(context->ret.pointer, out_obj->buffer.pointer,
 297                 context->ret.length);
 298         status =  AE_OK;
 299
 300 out_kfree:
 301         kfree(output.pointer);
 302         if (status != AE_OK)
 303                 context->ret.pointer = NULL;
 304         return status;
 305 }
 306 EXPORT_SYMBOL(acpi_run_osc);
 307
 308 bool osc_sb_apei_support_acked;
 309 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 310 static void acpi_bus_osc_support(void)
 311 {
 312         u32 capbuf[2];
 313         struct acpi_osc_context context = {
 314                 .uuid_str = sb_uuid_str,
 315                 .rev = 1,
 316                 .cap.length = 8,
 317                 .cap.pointer = capbuf,
 318         };
 319         acpi_handle handle;
 320
 321         capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
 322         capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 323 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
 324                         defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
 325         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
 326 #endif
 327
 328 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
 329         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
 330 #endif
 331
 332 #ifdef ACPI_HOTPLUG_OST
 333         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_HOTPLUG_OST_SUPPORT;
 334 #endif
 335
 336         if (!ghes_disable)
 337                 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_APEI_SUPPORT;
 338         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 339                 return;
 340         if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
 341                 u32 *capbuf_ret = context.ret.pointer;
 342                 if (context.ret.length > OSC_SUPPORT_TYPE)
 343                         osc_sb_apei_support_acked =
 344                                 capbuf_ret[OSC_SUPPORT_TYPE] & OSC_SB_APEI_SUPPORT;
 345                 kfree(context.ret.pointer);
 346         }
 347         /* do we need to check other returned cap? Sounds no */
 348 }
 349
 350 /* --------------------------------------------------------------------------
 351                                 Event Management
 352    -------------------------------------------------------------------------- */
 353
 354 #ifdef CONFIG_ACPI_PROC_EVENT
 355 static DEFINE_SPINLOCK(acpi_bus_event_lock);
 356
 357 LIST_HEAD(acpi_bus_event_list);
 358 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 359
 360 extern int event_is_open;
 361
 362 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
 363 {
 364         struct acpi_bus_event *event;
 365         unsigned long flags = 0;
 366
 367         /* drop event on the floor if no one's listening */
 368         if (!event_is_open)
 369                 return 0;
 370
 371         event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 372         if (!event)
 373                 return -ENOMEM;
 374
 375         strcpy(event->device_class, device_class);
 376         strcpy(event->bus_id, bus_id);
 377         event->type = type;
 378         event->data = data;
 379
 380         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 381         list_add_tail(&event->node, &acpi_bus_event_list);
 382         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 383
 384         wake_up_interruptible(&acpi_bus_event_queue);
 385
 386         return 0;
 387
 388 }
 389
 390 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
 391
 392 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
 393 {
 394         if (!device)
 395                 return -EINVAL;
 396         return acpi_bus_generate_proc_event4(device->pnp.device_class,
 397                                              device->pnp.bus_id, type, data);
 398 }
 399
 400 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
 401
 402 int acpi_bus_receive_event(struct acpi_bus_event *event)
 403 {
 404         unsigned long flags = 0;
 405         struct acpi_bus_event *entry = NULL;
 406
 407         DECLARE_WAITQUEUE(wait, current);
 408
 409
 410         if (!event)
 411                 return -EINVAL;
 412
 413         if (list_empty(&acpi_bus_event_list)) {
 414
 415                 set_current_state(TASK_INTERRUPTIBLE);
 416                 add_wait_queue(&acpi_bus_event_queue, &wait);
 417
 418                 if (list_empty(&acpi_bus_event_list))
 419                         schedule();
 420
 421                 remove_wait_queue(&acpi_bus_event_queue, &wait);
 422                 set_current_state(TASK_RUNNING);
 423
 424                 if (signal_pending(current))
 425                         return -ERESTARTSYS;
 426         }
 427
 428         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 429         if (!list_empty(&acpi_bus_event_list)) {
 430                 entry = list_entry(acpi_bus_event_list.next,
 431                                    struct acpi_bus_event, node);
 432                 list_del(&entry->node);
 433         }
 434         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 435
 436         if (!entry)
 437                 return -ENODEV;
 438
 439         memcpy(event, entry, sizeof(struct acpi_bus_event));
 440
 441         kfree(entry);
 442
 443         return 0;
 444 }
 445
 446 #endif  /* CONFIG_ACPI_PROC_EVENT */
 447
 448 /* --------------------------------------------------------------------------
 449                              Notification Handling
 450    -------------------------------------------------------------------------- */
 451
 452 static void acpi_bus_check_device(acpi_handle handle)
 453 {
 454         struct acpi_device *device;
 455         acpi_status status;
 456         struct acpi_device_status old_status;
 457
 458         if (acpi_bus_get_device(handle, &device))
 459                 return;
 460         if (!device)
 461                 return;
 462
 463         old_status = device->status;
 464
 465         /*
 466          * Make sure this device's parent is present before we go about
 467          * messing with the device.
 468          */
 469         if (device->parent && !device->parent->status.present) {
 470                 device->status = device->parent->status;
 471                 return;
 472         }
 473
 474         status = acpi_bus_get_status(device);
 475         if (ACPI_FAILURE(status))
 476                 return;
 477
 478         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 479                 return;
 480
 481         /*
 482          * Device Insertion/Removal
 483          */
 484         if ((device->status.present) && !(old_status.present)) {
 485                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 486                 /* TBD: Handle device insertion */
 487         } else if (!(device->status.present) && (old_status.present)) {
 488                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 489                 /* TBD: Handle device removal */
 490         }
 491 }
 492
 493 static void acpi_bus_check_scope(acpi_handle handle)
 494 {
 495         /* Status Change? */
 496         acpi_bus_check_device(handle);
 497
 498         /*
 499          * TBD: Enumerate child devices within this device's scope and
 500          *       run acpi_bus_check_device()'s on them.
 501          */
 502 }
 503
 504 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
 505 int register_acpi_bus_notifier(struct notifier_block *nb)
 506 {
 507         return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
 508 }
 509 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
 510
 511 void unregister_acpi_bus_notifier(struct notifier_block *nb)
 512 {
 513         blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
 514 }
 515 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
 516
 517 /**
 518  * acpi_bus_notify
 519  * ---------------
 520  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 521  */
 522 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 523 {
 524         struct acpi_device *device = NULL;
 525         struct acpi_driver *driver;
 526
 527         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
 528                           type, handle));
 529
 530         blocking_notifier_call_chain(&acpi_bus_notify_list,
 531                 type, (void *)handle);
 532
 533         switch (type) {
 534
 535         case ACPI_NOTIFY_BUS_CHECK:
 536                 acpi_bus_check_scope(handle);
 537                 /*
 538                  * TBD: We'll need to outsource certain events to non-ACPI
 539                  *      drivers via the device manager (device.c).
 540                  */
 541                 break;
 542
 543         case ACPI_NOTIFY_DEVICE_CHECK:
 544                 acpi_bus_check_device(handle);
 545                 /*
 546                  * TBD: We'll need to outsource certain events to non-ACPI
 547                  *      drivers via the device manager (device.c).
 548                  */
 549                 break;
 550
 551         case ACPI_NOTIFY_DEVICE_WAKE:
 552                 /* TBD */
 553                 break;
 554
 555         case ACPI_NOTIFY_EJECT_REQUEST:
 556                 /* TBD */
 557                 break;
 558
 559         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 560                 /* TBD: Exactly what does 'light' mean? */
 561                 break;
 562
 563         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 564                 /* TBD */
 565                 break;
 566
 567         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 568                 /* TBD */
 569                 break;
 570
 571         case ACPI_NOTIFY_POWER_FAULT:
 572                 /* TBD */
 573                 break;
 574
 575         default:
 576                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 577                                   "Received unknown/unsupported notification [%08x]\n",
 578                                   type));
 579                 break;
 580         }
 581
 582         acpi_bus_get_device(handle, &device);
 583         if (device) {
 584                 driver = device->driver;
 585                 if (driver && driver->ops.notify &&
 586                     (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 587                         driver->ops.notify(device, type);
 588         }
 589 }
 590
 591 /* --------------------------------------------------------------------------
 592                              Initialization/Cleanup
 593    -------------------------------------------------------------------------- */
 594
 595 static int __init acpi_bus_init_irq(void)
 596 {
 597         acpi_status status = AE_OK;
 598         union acpi_object arg = { ACPI_TYPE_INTEGER };
 599         struct acpi_object_list arg_list = { 1, &arg };
 600         char *message = NULL;
 601
 602
 603         /*
 604          * Let the system know what interrupt model we are using by
 605          * evaluating the \_PIC object, if exists.
 606          */
 607
 608         switch (acpi_irq_model) {
 609         case ACPI_IRQ_MODEL_PIC:
 610                 message = "PIC";
 611                 break;
 612         case ACPI_IRQ_MODEL_IOAPIC:
 613                 message = "IOAPIC";
 614                 break;
 615         case ACPI_IRQ_MODEL_IOSAPIC:
 616                 message = "IOSAPIC";
 617                 break;
 618         case ACPI_IRQ_MODEL_PLATFORM:
 619                 message = "platform specific model";
 620                 break;
 621         default:
 622                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 623                 return -ENODEV;
 624         }
 625
 626         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 627
 628         arg.integer.value = acpi_irq_model;
 629
 630         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 631         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 632                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 633                 return -ENODEV;
 634         }
 635
 636         return 0;
 637 }
 638
 639 u8 acpi_gbl_permanent_mmap;
 640
 641
 642 void __init acpi_early_init(void)
 643 {
 644         acpi_status status = AE_OK;
 645
 646         if (acpi_disabled)
 647                 return;
 648
 649         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 650
 651         /* enable workarounds, unless strict ACPI spec. compliance */
 652         if (!acpi_strict)
 653                 acpi_gbl_enable_interpreter_slack = TRUE;
 654
 655         acpi_gbl_permanent_mmap = 1;
 656
 657         /*
 658          * If the machine falls into the DMI check table,
 659          * DSDT will be copied to memory
 660          */
 661         dmi_check_system(dsdt_dmi_table);
 662
 663         status = acpi_reallocate_root_table();
 664         if (ACPI_FAILURE(status)) {
 665                 printk(KERN_ERR PREFIX
 666                        "Unable to reallocate ACPI tables\n");
 667                 goto error0;
 668         }
 669
 670         status = acpi_initialize_subsystem();
 671         if (ACPI_FAILURE(status)) {
 672                 printk(KERN_ERR PREFIX
 673                        "Unable to initialize the ACPI Interpreter\n");
 674                 goto error0;
 675         }
 676
 677         status = acpi_load_tables();
 678         if (ACPI_FAILURE(status)) {
 679                 printk(KERN_ERR PREFIX
 680                        "Unable to load the System Description Tables\n");
 681                 goto error0;
 682         }
 683
 684 #ifdef CONFIG_X86
 685         if (!acpi_ioapic) {
 686                 /* compatible (0) means level (3) */
 687                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 688                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 689                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 690                 }
 691                 /* Set PIC-mode SCI trigger type */
 692                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 693                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 694         } else {
 695                 /*
 696                  * now that acpi_gbl_FADT is initialized,
 697                  * update it with result from INT_SRC_OVR parsing
 698                  */
 699                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 700         }
 701 #endif
 702
 703         status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
 704         if (ACPI_FAILURE(status)) {
 705                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 706                 goto error0;
 707         }
 708
 709         return;
 710
 711       error0:
 712         disable_acpi();
 713         return;
 714 }
 715
 716 static int __init acpi_bus_init(void)
 717 {
 718         int result = 0;
 719         acpi_status status = AE_OK;
 720         extern acpi_status acpi_os_initialize1(void);
 721
 722         acpi_os_initialize1();
 723
 724         status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
 725         if (ACPI_FAILURE(status)) {
 726                 printk(KERN_ERR PREFIX
 727                        "Unable to start the ACPI Interpreter\n");
 728                 goto error1;
 729         }
 730
 731         /*
 732          * ACPI 2.0 requires the EC driver to be loaded and work before
 733          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 734          * is called).
 735          *
 736          * This is accomplished by looking for the ECDT table, and getting
 737          * the EC parameters out of that.
 738          */
 739         status = acpi_ec_ecdt_probe();
 740         /* Ignore result. Not having an ECDT is not fatal. */
 741
 742         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 743         if (ACPI_FAILURE(status)) {
 744                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 745                 goto error1;
 746         }
 747
 748         /*
 749          * _OSC method may exist in module level code,
 750          * so it must be run after ACPI_FULL_INITIALIZATION
 751          */
 752         acpi_bus_osc_support();
 753
 754         /*
 755          * _PDC control method may load dynamic SSDT tables,
 756          * and we need to install the table handler before that.
 757          */
 758         acpi_sysfs_init();
 759
 760         acpi_early_processor_set_pdc();
 761
 762         /*
 763          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
 764          * is necessary to enable it as early as possible.
 765          */
 766         acpi_boot_ec_enable();
 767
 768         printk(KERN_INFO PREFIX "Interpreter enabled\n");
 769
 770         /* Initialize sleep structures */
 771         acpi_sleep_init();
 772
 773         /*
 774          * Get the system interrupt model and evaluate \_PIC.
 775          */
 776         result = acpi_bus_init_irq();
 777         if (result)
 778                 goto error1;
 779
 780         /*
 781          * Register the for all standard device notifications.
 782          */
 783         status =
 784             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
 785                                         &acpi_bus_notify, NULL);
 786         if (ACPI_FAILURE(status)) {
 787                 printk(KERN_ERR PREFIX
 788                        "Unable to register for device notifications\n");
 789                 goto error1;
 790         }
 791
 792         /*
 793          * Create the top ACPI proc directory
 794          */
 795         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
 796
 797         return 0;
 798
 799         /* Mimic structured exception handling */
 800       error1:
 801         acpi_terminate();
 802         return -ENODEV;
 803 }
 804
 805 struct kobject *acpi_kobj;
 806 EXPORT_SYMBOL_GPL(acpi_kobj);
 807
 808 static int __init acpi_init(void)
 809 {
 810         int result;
 811
 812         if (acpi_disabled) {
 813                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
 814                 return -ENODEV;
 815         }
 816
 817         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
 818         if (!acpi_kobj) {
 819                 printk(KERN_WARNING "%s: kset create error\n", __func__);
 820                 acpi_kobj = NULL;
 821         }
 822
 823         init_acpi_device_notify();
 824         result = acpi_bus_init();
 825         if (result) {
 826                 disable_acpi();
 827                 return result;
 828         }
 829
 830         pci_mmcfg_late_init();
 831         acpi_scan_init();
 832         acpi_ec_init();
 833         acpi_debugfs_init();
 834         acpi_sleep_proc_init();
 835         acpi_wakeup_device_init();
 836         return 0;
 837 }
 838
 839 subsys_initcall(acpi_init);